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Abstract

Presently, electrostatic powder coating processes are applicable only to metallic surfaces, because the part to be coated must be electrically conductive. However, by pretreating nonconductors with proper surfactants, as for example, a solution of about 10% TERGITOL* P-28 and 90% Isopropanol by volume, dielectric surfaces appear to attain sufficient electrical conduction to powder coat with an electrostatic process. Another unique feature of this process is the ability to selectively powder coat specific portions of the nonconductive substrate.

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United States

Language

English (United States)

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Selective Electrostatic Coating of Nonconductive Substrates

Presently, electrostatic powder coating processes are applicable only to
metallic surfaces, because the part to be coated must be electrically conductive.
However, by pretreating nonconductors with proper surfactants, as for example,
a solution of about 10% TERGITOL* P-28 and 90% Isopropanol by volume,
dielectric surfaces appear to attain sufficient electrical conduction to powder coat
with an electrostatic process. Another unique feature of this process is the ability
to selectively powder coat specific portions of the nonconductive substrate.

Powder coating can be applied by either a fluidized bed or electrostatic
coating process. The fluidized bed process utilizes a tank in which powder is
suspended by an upward stream of air passing through a diffuser plate in the
bottom of the tank. The part to be coated is pre-heated in an oven to a
temperature above the melting point of the coating powder. The heated part is
then immersed in the fluidized powder and moved in a predetermined pattern, to
insure particle penetration into all recesses and openings. As the particles
contact the heated part they will melt, adhere, and flow out to form a smooth
continuous film. Either thermoplastic or thermosetting powder may be used in
this process, which permits the application of a coating in a single dip operation.

The electrostatic coating process is based on the principle that oppositely
charged objects attract, and utilizes powder fed from a reservoir or fluidized bed
to a source where a high-voltage, low-amperage electrostatic charge is applied to
the particles. The powder receives the charge due to transfer of electrons from
source to powder. The transfer takes place through contact with the highly
charged source and through the surrounding ionized air. The part to be coated is
electrically grounded. The charged powder is blown against the p...